Study of the manufactured copolymers of ethylene with tetrafluoroethylene.

• The copolymers products of DUPONT™ TEFZEL® ETFE 750 and Fluon® AGC ETFE TL-581 were characterized. • During pyrolytic processing of the copolymers, the degradation product was obtained. • The basis of the molecular structure of all three products studied is a chains of fragments of [-CH 2 -CH 2 -CF 2 -CF 2 -] n. • The molecular chains in structure of degradation product are shorter and are closed by the –HF-CF 2 terminal groups. • The product of degradation differs from the initial objects in morphology and thermal properties. The glasses in the MnNbOF 5 -BaF 2 -InF 3 -ErF 3 and CdNbOF 5 -BaF 2 -InF 3 systems have been obtained and investigated by means of IR- and Raman spectroscopy. The structures of glass networks are discussed. The analysis of the inelastic light scattering spectra are used to identify the contribution of the Er3+ photoluminescence in the glasses studied. The contribution of the indium photoluminescence into the inelastic light scattering spectrum of the glasses in the СdNbOF 5 -BaF 2 -InF 3 system has been established at scattering excitation by the laser with the wavelength of 532 nm. [ABSTRACT FROM AUTHOR]